CN103458562A - Control device for small LED strings - Google Patents
Control device for small LED strings Download PDFInfo
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- CN103458562A CN103458562A CN2012105008405A CN201210500840A CN103458562A CN 103458562 A CN103458562 A CN 103458562A CN 2012105008405 A CN2012105008405 A CN 2012105008405A CN 201210500840 A CN201210500840 A CN 201210500840A CN 103458562 A CN103458562 A CN 103458562A
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- 239000004065 semiconductor Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000007423 decrease Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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- 238000004886 process control Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/39—Circuits containing inverter bridges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention provides a control device for small LED strings. The high-voltage N-type component is connected in series with the low-voltage current-limiting switch unit, and the low-voltage current-limiting component is switched when the voltage or the current on the detection path is greater than or less than a preset value. The high voltage N-type components are indirectly controlled. That is, when the conduction current flowing through the low-voltage current-limiting switch increases or decreases, the conduction current flowing through the corresponding high-voltage N-type component also increases or decreases.
Description
Technical field
The present invention controls high-voltage LED about the combination by current limiting low-voltage switch and high-pressure N-shaped (N-channel) assembly, but the simplified topology process, and reduce production costs; Not only effectively reduce the 120Hz optical flicker phenomenon that conventional high-tension LED produces, more can improve electrical efficiency.
Background technology
Long string high-voltage LED production cost is more and more cheap, and widely popular institute adopts.But the mode of high voltage control still has shortcoming to be improved.For example, U.S. Pat P No.6989807, USPNo.7439944 or USP No.7081722 have just exposed point and the drive current problem that is fixed current etc. switching time.
For addressing the above problem, TaiWan, China patent publication No. 201134293 proposes a kind of integrated circuit that drives the high-voltage LED bulb.Referring to wherein Fig. 1 and Fig. 2, this device has current limliting unit (NMOS), by opening or close current limliting unit switching LED storehouse, can improve power factor correction function and reduce total harmonic distortion.Yet, otherness and variations in temperature on processing procedure arranged, therefore alternately time and the more difficult control of electric current between the conducting voltage of several high pressure NMOSs.As a result, the excessive or current vanishes overlong time of LED conducting immediate current possibility, produce optical flicker (Flicker).And the total current open circuit has phenomenon discontinuous and that immediate current is excessive.
In addition, while driving in a conventional manner long string LED, to grow brightness brighter because of average ON time for front end LED, and tail end LED ON time is shorter, and brightness is darker; It is so-called 120Hz optics ripple.And traditional approach drives the efficiency of high-voltage LED also poor.Develop efficiency if increase more multi-control node, can increase again the puzzlement of production cost.
For improving the disappearance of above-mentioned known techniques, the present invention proposes the control device of the little string of a kind of LED, can not only effectively promote wattage output, more can reduce electromagnetic interference.
Summary of the invention
The object of the present invention is to provide the control device of the little string of a kind of LED, can reduce production costs, reduce switching noise and disturb, and the simplified control circuit layout.
The little string of LED of the present invention can be ground connection or earth-free; Can be formed by the LED unit of a plurality of series connection, and that the LED unit can comprise is one or more the LED of serial or parallel connection.
The control device of the little string of LED of the present invention mainly comprises plurality of high voltage N-type assembly and a plurality of current limiting low-voltage switch.Wherein each high-pressure N-shaped assembly is electrically connected to the current output terminal of corresponding LED unit.Wherein each current limiting low-voltage switch comprises a low pressure N-type assembly, be electrically connected to corresponding high-pressure N-shaped assembly, and with corresponding LED unit parallel connection, electric current is to flow to corresponding current limiting low-voltage switch by high-pressure N-shaped assembly, and alleged low pressure and high pressure are according to its relative breakdown voltage (Breakdown Voltage).By this, when the On current of the current limiting low-voltage switch of flowing through increases or reduces, the On current of the corresponding high-pressure N-shaped assembly of flowing through also increases thereupon or reduces.
High-pressure N-shaped assembly or low pressure N-type assembly can be but be not limited to two-carrier (Bi-polar) transistor of metal-oxide semiconductor (MOS) (Metal Oxide Semiconductor, MOS) transistor or Electricity As Duo Number Load, and other switch module is also applicable.
By control device of the present invention, when the input current of current limiting low-voltage switch increases, the current limiting low-voltage switch that wherein current potential is minimum is for opening, and the On current of the higher current limiting low-voltage switch of other current potential is reduced, and the On current of the higher high-pressure N-shaped assembly of correspondence of this current potential of flowing through also reduces thereupon.Perhaps, when the current limiting low-voltage switch of high potential receives than " electric current diminishes and controls signal " of the current limiting low-voltage switch of electronegative potential, the On current of current limiting low-voltage switch of this high potential of flowing through reduces, and the On current of the corresponding high-pressure N-shaped assembly that makes to flow through also reduces thereupon.
The unlatching of above-mentioned current limiting low-voltage switch or electric current diminish can via but be not limited to outside or built-in master and servant's controller and judge or transmit signal, line design that also can be suitable via other is reached.By this, can make the On current of the current limiting low-voltage switch of high potential be controlled by the current limiting low-voltage switch than electronegative potential.
Control device of the present invention, also can comprise at least one voltage or current-sensing circuit, in order to detect voltage or the electric current on corresponding LED unit to the path of corresponding current limiting low-voltage switch.By this, when detected voltage or electric current are greater than a preset value, corresponding current limiting low-voltage switch is closed.Perhaps, when detected voltage or electric current are less than this preset value, corresponding current limiting low-voltage switch is for opening.
In addition, common high-low pressure list stone chip (monolithic chip) is incorporated into all hi-lo circuits on one chip at present.That is the electric current of high-pressure N-shaped assembly and low pressure N-type assembly is all horizontal (lateral).Yet the conducting resistance of the high potential assembly of single stone chip is limited by the plane space of horizontal direction, so conducting resistance is higher compared with tradition rectilinear (vertical) high potential assembly.Therefore, the high-pressure N-shaped assembly that the present invention uses is preferably traditional rectilinear framework.Overleaf, and source electrode and grid be in front in the drain electrode of rectilinear assembly, and it is positive that electric current is flowed into by the back side, so conducting resistance is lower than the assembly of horizontal.In conjunction with rectilinear high-pressure N-shaped assembly and horizontal low voltage control integrated circuit, can reduce manufacturing cost by metal pressure-welding (Wire bond) or alternate manner.
The said electric connection of the present invention also can be described as electrical couplings (coupling), is not restricted to direct or indirect connection, as long as can reach the purpose of framework of the present invention.
The present invention has following effect:
1, monitor the source electrode low pressure of high-pressure N-shaped assembly, be equivalent to the output voltage of drain electrode high pressure or LED, therefore need not set up monitoring point in hyperbaric environment, structure is simpler.
2, utilize the handoff functionality of current limiting low-voltage switch to control the high-voltage LED electric current, can open and close fast LED, make system power more stable, input current presents continuously, significantly reduce EMI and disturb, and total harmonic distortion is low.
3, layout process is simple; Can simplify grid and the source electrode of controlling the rectilinear high-pressure N-shaped assembly of traditional type online with controller IC, the puzzlement that winds the line of the layout that causes.
4, utilize the earth-free mode of control integration circuit with long string LED and connect, can reduce the control circuit power consumption, in the time of more can reducing long string, because of the ripple flicker of the different 120HZ that cause in LED position.
The accompanying drawing explanation
What Fig. 1 showed that first embodiment of the invention controls high-pressure N-shaped assembly and LED with the current limiting low-voltage switch determines the electric current framework.
Fig. 2 shows the framework of Fig. 1 mesohigh N-type assembly and current limiting low-voltage switch.
Fig. 3 shows the framework of second embodiment of the invention.
Fig. 4 shows the framework of Fig. 3 mesohigh N-type assembly and current limiting low-voltage switch.
Fig. 5 shows the framework of third embodiment of the invention.
Fig. 6 shows the framework of Fig. 5 mesohigh N-type assembly and current limiting low-voltage switch.
Fig. 7 shows the simple and easy framework of testing use.
Fig. 8 is presented under high working voltage, the relation of the source voltage of PWM input signal and high-pressure N-shaped assembly.
Fig. 9 shows another simple and easy framework of testing use.
Figure 10 is presented under low-work voltage, the relation of the drain voltage of input voltage wave mode and high-pressure N-shaped assembly.
Figure 11 shows the drain current value of high-pressure N-shaped assembly under different drain voltages.
The primary clustering symbol description
Current limiting low-voltage switch 21-25,31-34,41-44
Outside master-servant's controller 51
Built-in distributed master-servant's controller 52
The little string 70,80 of LED
LED unit 701-705,801-805
AC AC power 901
High-pressure N-shaped assembly HV1-HV5
Electric current output contact Iout
Operational amplifier K1
Comparator K2
Low pressure N-type assembly LV2
Resistance R 1, R2, R4, R5
High resistance measurement R3
Signal input end S1, S3
Signal output end S2, S4
Selector SE1
Voltage-output contact Vout
Zener diode Z1
Embodiment
Fig. 1 shows one of the preferred embodiment of the control device of high-voltage LED of the present invention.The little string 70 of LED has 5 LED unit 701-705, and each LED unit comprises several LEDs.Control device sequentially comprises the master of high-pressure N-shaped assembly (HV NMOS) HV1-HV5 of 5 correspondences, 5 current limiting low-voltage switch (or constant current switch) 21-25 and an outside-servant's controller 51 by high potential to electronegative potential." outside " of this specification or " built-in " are for the current limiting low-voltage switch.
The current input terminal of the little string 70 of LED is connected to AC AC power 901 and bridge rectifier 902.The little string 70 of LED can be the some of the long string of a LED, and control device also can be connected and be controlled the corresponding little string of LED.
In the little string 70 of LED, the current output terminal of each LED unit is connected to the drain electrode of corresponding high-pressure N-shaped assembly.The source electrode of high-pressure N-shaped assembly is connected to corresponding current limiting low-voltage switch 21-25, and grid is connected to Zener diode Z1, and fixed-bias transistor circuit is provided.Zener diode Z1 is connected to bridge rectifier 902 through resistance R 1, and in parallel with capacitor C 1.The voltage source of control device is provided by Zener diode Z1 voltage stabilizing.
Each current limiting low-voltage switch has a signal input end S1 and a signal output end S2, is connected to respectively signal output end and the signal input end of master-servant's controller (master-slave) 51 correspondences.Each current limiting low-voltage switch also has a voltage output end and a current output terminal, is connected to respectively Voltage-output contact Vout and the electric current output contact Iout of control device, finally is connected to Zener diode Z1.Voltage-output contact Vout is via resistance R 2, then is connected to electric current output contact Iout.
Fig. 2 is key diagram 1 mesohigh N-type assembly and the framework of corresponding current limiting low-voltage switch, and take high-pressure N-shaped assembly HV2 and current limiting low-voltage switch 22 is example.Current limiting low-voltage switch 22 comprises low pressure N-type assembly (LV NMOS) LV2, a comparator K2 and a high resistance measurement R3.Comparator K2 and high resistance measurement R3 form a voltage detection circuit, and voltage detection circuit, master-servant's controller and operational amplifier (OPAMP) K1 and electric connection circuit form a control framework.The drain electrode of low pressure N-type assembly LV2 is connected to the source electrode of corresponding high-pressure N-shaped assembly HV2, input anode and the resistance R 3 of comparator K2; Grid is connected to the signal input end S1 of current limiting low-voltage switch, accepts master-servant's controller 51 output signals and controls; Source electrode is connected to Voltage-output contact Vout.Electric current is by the current output terminal of LED unit, through high-pressure N-shaped assembly HV2 to current limiting low-voltage switch 21.Resistance R 3 is connected to electric current output contact Iout again.The input negative terminal of comparator K2 is connected to reference potential (Vref2), as current limliting breakover point reference potential.The signal output end S2 of current limiting low-voltage switch 22 is connected to the signal input end of master-servant's controller 51.Master-servant's controller 51 also connects an operational amplifier K1, with resistance R 2, is connected and forms main formula current limitation effect.
When the input voltage of the little string 70 of LED increases, current limiting low-voltage switch 21-25 sequentially opens.When the voltage of current limiting low-voltage switch 22 is greater than reference potential Vref2, comparator K2 wherein transmits " H " signal to master-servant's controller 51 through signal output end S2.Now, if master-servant's controller 51 also transmits " H " signal to signal input end S1, low pressure N-type assembly LV2 will be unlocked.Simultaneously, after master-servant's controller 51 is anti-phase by the output signal of current limiting low-voltage switch 22, transmit the current limiting low-voltage switch 21 of a signal to high potential, make it reduce On current or close.In this process, the grid of the low pressure N-type assembly of high-pressure N-shaped assembly HV1-HV4 and current limiting low-voltage switch 25 all keeps perseverance to open state.
Similarly, when the voltage of current limiting low-voltage switch 23 is greater than reference potential Vref2, comparator K2 wherein transmits " H " signal to master-servant's controller 51.Now, master-servant's controller 51 will transmit a signal to current limiting low-voltage switch 23, make its unlatching; Transmit the current limiting low- voltage switch 21 and 22 of a signal to high potential simultaneously, make it reduce On current or close.
Otherwise, when the input voltage of the little string 70 of LED reduces, when the voltage of current limiting low-voltage switch 25 is less than reference potential Vref2, comparator K2 wherein transmits " L " signal to master-servant's controller 51.Now, after master-servant's controller 51 is anti-phase by the output signal of current limiting low-voltage switch 25, transmit a signal to current limiting low-voltage switch 24, make it increase On current.
From above-mentioned framework, being characterized as of apparatus of the present invention: the low pressure N-type assembly of high potential or the On current of current limiting low-voltage switch are to be controlled by than the electronegative potential person.In addition, the unlatching of LED unit or to close be to control by the current limiting low-voltage switch, but not high-pressure N-shaped assembly.Because starting and closing low pressure assembly speed, therefore, in handoff procedure, can reduce the problem of LED string discontinuous current.
Fig. 3 shows second preferred embodiment of control device of high-voltage LED of the present invention.The little string 80 of the LED of the present embodiment has 5 LED unit 801-805, and each LED unit comprises the LED of several serial connections.LED unit 801-804 connects corresponding high-pressure N-shaped assembly HV1-HV4 and current limiting low-voltage switch 31-34,805 of LED unit ground connection separately.Compared to last embodiment, the present embodiment is without the special body of outside master-servant's controller 51, but will in distributed master-servant's controller, be built in each current limiting low-voltage switch 31-34.
As shown in Figure 4, take current limiting low-voltage switch 32 as example, comparator K2 and high resistance measurement R3 also form a voltage detection circuit.Voltage detection circuit, distributed master-servant's controller 52, selector SE1 and operational amplifier K1 and electric connection circuit form a control framework.Distributed master-servant's controller 52 comprises inverter (inverter) and logic module AND.The input anode of operational amplifier K1 is connected to reference potential Vref1 equally, and the input negative terminal is connected to the source electrode of low pressure N-type assembly LV2, and output is connected to the one-input terminal of selector SE1.Selector SE1 is controlled by the distributed master and servant logic device 52 built-in than the current limiting low-voltage switch of electronegative potential, if the signal that signal input end S3 receives is " H ", selector SE1 switches to the output of operational amplifier K1; If signal input end S3 signal is " L ", selector SE1 is connected to electric current output contact Iout by the grid of low pressure N-type assembly LV2, closes low pressure N-type assembly LV2.
In this embodiment, when the input voltage of the little string 80 of LED increases, current limiting low-voltage switch 31-34 sequentially opens.Take current limiting low-voltage switch 32 as example, and when the drain voltage of low pressure N-type assembly LV2 is greater than reference potential Vref2, comparator K2 wherein transmits " H " signal to distributed master and servant's logic device 52.Now, if signal input end S3 also receives signal " H ", low pressure N-type assembly LV2 will be unlocked.Simultaneously, reverser is " L " by the signal transition, is resent to logic module AND, makes signal output end S4 output signal for " L ".So the current limiting low-voltage switch 31 of high potential receives signal " L ", and then reduce On current or close.And, in whole Push And Release process control process, the grid of the low pressure N-type assembly of high-pressure N-shaped assembly HV1-HV4 and current limiting low-voltage switch 34 still keeps perseverance to open state.
Fig. 5 shows the 3rd preferred embodiment of control device of high-voltage LED of the present invention.Compared to first and two embodiment, the present embodiment is without outside master-servant's controller, also distribution-free formula master-servant's controller in current limiting low-voltage switch 41-44.
As shown in Figure 6, take current limiting low-voltage switch 42 as example, comparator K2 and high resistance measurement R3 also form a voltage detection circuit.Voltage detection circuit, selector SE1 and operational amplifier K1 and electric connection circuit form a control framework.The output of comparator K2 is connected to selector SE1 by internal wiring.The zero-input terminal of selector SE1 is connected to the output of comparator K2, and one-input terminal is connected to electric current output contact Iout.
When the input voltage of the little string 80 of LED increases, while making the drain voltage of low pressure N-type assembly LV2 be greater than reference potential Vref2, comparator K2 transmits the control end of " H " signal to selector SE1, and the SE1 output is connected to one-input terminal.So the grid of low pressure N-type assembly LV2 is connected to electric current output contact Iout, to reduce On current or it is closed.Otherwise if the drain voltage of low pressure N-type assembly LV2 is less than reference potential Vref2, comparator K2 transmits " L " signal to selector SE1, makes the output of the grid concatenation operation amplifier K3 of low pressure N-type assembly LV2, to open current limiting low-voltage switch 42.And, in whole Push And Release process control process, the grid of the low pressure N-type assembly of high-pressure N-shaped assembly HV1-HV4 and current limiting low-voltage switch 44 all keeps perseverance to open state.
Measure and analyze:
The framework of second embodiment of take is basis, tests the combination of single high-pressure N-shaped assembly and easy current limiting low-voltage switch, as shown in Figure 7.Resistance R 1 is about 200K Ω, the breakdown voltage of Zener diode Z1 (Breakdown Voltage) or withstand voltage be 12V.The about 600V of the breakdown voltage of the drain electrode of high-pressure N-shaped assembly HV2, it is 150V that DC voltage is set in drain electrode, grid is connected to the tie point of Zener diode Z1 and resistance R 1.Easy current limiting low-voltage switch is connected to the source electrode of high-pressure N-shaped assembly HV2, and constant current is set I=56mA, and the drain electrode breakdown voltage of low pressure assembly is 40V.The signal input end S3 input of easy current limiting low-voltage switch is PWM signal (square wave frequency=20KHz, Duty cycle=50%) fixedly.When the PWM signal is " H ", the current limiting low-voltage switch is opening; When the PWM signal is " L ", the current limiting low-voltage switch is closed condition.As shown in Figure 8, the figure below is the PWM input signal to measurement, and the figure top is the source voltage of high-pressure N-shaped assembly HV2.In handoff procedure, because drain voltage and the stray inductance of high-pressure N-shaped assembly can produce noise.Yet the source electrode noise voltage of high-pressure N-shaped assembly only limits to 11.5V, and perseverance is less than grid potential 12V.When moment switching 150V voltage is carried out in the drain electrode of high-pressure N-shaped assembly HV2, the current limiting low-voltage switch be connected in series for this assembly source electrode has protective effect.
Fig. 9 shows the simple combination framework of similar Fig. 7, but the drain electrode of high-pressure N-shaped assembly HV2 is connected in series the about 30Ohm of a resistance R 5, and is connected to DC=20V voltage, and the grid fixed voltage is 12V.Test result as shown in figure 10.The figure below is the input voltage wave mode, and the figure top measures for high-pressure N-shaped assembly drain electrode the current potential arrived.When 14us, can reach default constant current value (56mA) switching time, and keep constant current state.Shut-in time approximately is less than 2us, therefore can be equivalent to rapidly the high potential assembly switching.
The current limiting low-voltage switch is set as two constant current values (56mA and 156mA), and Figure 11 shows the drain current value of high-pressure N-shaped assembly under different drain voltages.When the drain voltage of high-pressure N-shaped assembly higher than breakover voltage (V
knee-Point) when 0.6V and 1.3V, electric current is the constant current district, and the drain voltage of low pressure N-type assembly is also along with the drain voltage of high-pressure N-shaped assembly rises and rises, both only differ ~ 0.4V.
In addition, use the framework of Fig. 3 embodiment, there are 6 LEDs LED unit 801, each own 13 LEDs of LED unit 802-804, and there are 7 LEDs LED unit 805,52 LEDs altogether.The Vf of each LEDs is about 3V, and the input voltage of AC end is 110V, and crest voltage is 155V.
The grid of four high-pressure N-shaped assembly HV1-HV4 all is connected to the negative electrode of Zener diode Z1, produces fixedly direct voltage 36V.The corresponding current limiting switch of the source electrode of each N-type high potential assembly.The potential minimum of whole control circuit is connected to the current input terminal of last LED unit 805, can promote capacity usage ratio.Electric current is used and is heightened the PF value with the linear rising of input voltage, and the setting maximum output current is 80mA, and wattage output is about 6.23W(=110V * 80/ √ 2mA).When the input voltage peak value approximately is greater than 42V, 7 LEDs " at first " of 6 LEDs of LED unit 801 and LED unit 805 and " simultaneously " are activated to be lighted, and contributes to the Integral luminous uniformity of light fixture.By metric data, learnt:
Power factor correcting (Power Factor Correction, PFC)=0.98
Total harmonic distortion (Total Harmonic Distortion, THD)=12%
Luminous flux=120lm/W
According to above-described embodiment framework and test result, provable the present invention has following effect:
1, monitor the source electrode low pressure of high-pressure N-shaped assembly, be equivalent to the output voltage of drain electrode high pressure or LED, therefore need not set up monitoring point in hyperbaric environment, structure is simpler.
2, utilize the handoff functionality of current limiting low-voltage switch to control the high-voltage LED electric current, can open and close fast LED, make system power more stable, input current presents continuously, significantly reduce EMI and disturb, and total harmonic distortion is low.
3, layout process is simple; Can simplify grid and the source electrode of controlling the rectilinear high-pressure N-shaped assembly of traditional type online with controller IC, the puzzlement that winds the line of the layout that causes.
4, utilize the earth-free mode of control integration circuit with long string LED and connect, can reduce the control circuit power consumption, in the time of more can reducing long string, because of the ripple flicker of the different 120HZ that cause in LED position.
Claims (15)
1. the control device of the little string of LED, the little string of this LED is comprised of the LED unit of a plurality of series connection; It is characterized in that, this device comprises:
Plurality of high voltage N-type assembly, wherein each high-pressure N-shaped assembly is electrically connected to the current output terminal of corresponding LED unit; And
A plurality of current limiting low-voltage switches, wherein each current limiting low-voltage switch comprises a low pressure N-type assembly, be electrically connected to corresponding high-pressure N-shaped assembly, and with corresponding LED unit parallel connection, electric current is to flow to corresponding current limiting low-voltage switch by high-pressure N-shaped assembly, and alleged low pressure and high pressure are according to its relative breakdown voltage.
2. device as claimed in claim 1, it is characterized in that: the little string of this LED is ground connection or earth-free.
3. device as claimed in claim 1, it is characterized in that: this high-pressure N-shaped assembly or low pressure N-type assembly are metal oxide semiconductor transistor or double carrier transistor.
4. device as claimed in claim 1 is characterized in that: when the On current of the current limiting low-voltage switch of flowing through increases or reduces, the On current of the corresponding high-pressure N-shaped assembly of flowing through also increases thereupon or reduces.
5. the control device of the little string of LED, the little string of this LED is comprised of the LED unit of a plurality of series connection; It is characterized in that, this device comprises:
Plurality of high voltage N-type assembly, wherein each high-pressure N-shaped assembly is electrically connected to the current output terminal of corresponding LED unit; And
A plurality of current limiting low-voltage switches, wherein each current limiting low-voltage switch comprises a low pressure N-type assembly, be electrically connected to corresponding high-pressure N-shaped assembly, and with corresponding LED unit parallel connection, electric current is to flow to corresponding current limiting low-voltage switch by high-pressure N-shaped assembly, and alleged low pressure and high pressure are according to its relative breakdown voltage;
By this, when the input current of current limiting low-voltage switch increases, the current limiting low-voltage switch that wherein current potential is minimum is for opening, and the On current of the higher current limiting low-voltage switch of other current potential is reduced, and the On current of the higher high-pressure N-shaped assembly of correspondence of this current potential of flowing through also reduces thereupon.
6. device as claimed in claim 5, it is characterized in that: the little string of this LED is ground connection or earth-free.
7. device as claimed in claim 5, it is characterized in that: this high-pressure N-shaped assembly or low pressure N-type assembly are metal oxide semiconductor transistor or double carrier transistor.
8. device as claimed in claim 5 is characterized in that: it is to judge via outside or built-in master and servant's controller that the unlatching of this current limiting low-voltage switch or electric current diminish.
9. the control device of the little string of LED, the little string of this LED is comprised of the LED unit of a plurality of series connection; It is characterized in that, this device comprises:
Plurality of high voltage N-type assembly, wherein each high-pressure N-shaped assembly is electrically connected to the current output terminal of corresponding LED unit; And
A plurality of current limiting low-voltage switches, wherein each current limiting low-voltage switch comprises a low pressure N-type assembly, be electrically connected to corresponding high-pressure N-shaped assembly, and with corresponding LED unit parallel connection, electric current is to flow to corresponding current limiting low-voltage switch by high-pressure N-shaped assembly, and alleged low pressure and high pressure are according to its relative breakdown voltage;
By this, when the current limiting low-voltage switch of high potential receives than " electric current diminishes and controls signal " of the current limiting low-voltage switch of electronegative potential, the On current of current limiting low-voltage switch of this high potential of flowing through reduces, and the On current of the corresponding high-pressure N-shaped assembly that makes to flow through also reduces thereupon.
10. device as claimed in claim 9, it is characterized in that: the little string of this LED is ground connection or earth-free.
11. device as claimed in claim 9 is characterized in that: this high-pressure N-shaped assembly or low pressure N-type assembly are metal oxide semiconductor transistor or double carrier transistor.
12. device as claimed in claim 9 is characterized in that: the current limiting low-voltage switch of this high potential is via master and servant's controller, receives " electric current diminishes and controls signal " than the current limiting low-voltage switch of electronegative potential.
13. the control device of the little string of LED, the little string of this LED is comprised of the LED unit of a plurality of series connection; It is characterized in that, this device comprises:
At least one high-pressure N-shaped assembly, wherein each high-pressure N-shaped assembly is electrically connected to the current output terminal of corresponding LED unit; And
At least one current limiting low-voltage switch, wherein each current limiting low-voltage switch comprises a low pressure N-type assembly, be electrically connected to corresponding high-pressure N-shaped assembly, and with corresponding LED unit parallel connection, electric current is to flow to corresponding current limiting low-voltage switch by high-pressure N-shaped assembly, and alleged low pressure and high pressure are according to its relative breakdown voltage;
At least one voltage or current-sensing circuit, in order to detect voltage or the electric current on corresponding LED unit to the path of corresponding current limiting low-voltage switch;
By this, when detected voltage or electric current are greater than a preset value, corresponding current limiting low-voltage switch is closed, or, when detected voltage or electric current are less than this preset value, corresponding current limiting low-voltage switch is for opening.
14. device as claimed in claim 13 is characterized in that: the little string of this LED is ground connection or earth-free.
15. device as claimed in claim 13 is characterized in that: this high-pressure N-shaped assembly or low pressure N-type assembly are metal oxide semiconductor transistor or double carrier transistor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101119651 | 2012-06-01 | ||
| TW101119651A TW201352055A (en) | 2012-06-01 | 2012-06-01 | Apparatus for controlling LED sub-series |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103458562A true CN103458562A (en) | 2013-12-18 |
Family
ID=47826445
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012203561146U Expired - Fee Related CN202799281U (en) | 2012-06-01 | 2012-07-20 | Control device for small LED strings |
| CN2012105008405A Pending CN103458562A (en) | 2012-06-01 | 2012-11-29 | Control device for small LED strings |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012203561146U Expired - Fee Related CN202799281U (en) | 2012-06-01 | 2012-07-20 | Control device for small LED strings |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20140028206A1 (en) |
| EP (1) | EP2670217A1 (en) |
| JP (1) | JP2013251537A (en) |
| KR (1) | KR20130135757A (en) |
| CN (2) | CN202799281U (en) |
| TW (1) | TW201352055A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106664757A (en) * | 2014-06-30 | 2017-05-10 | 艾利迪公司 | Optoelectronic circuit having light-emitting diodes |
| CN107959991A (en) * | 2017-10-23 | 2018-04-24 | 东莞达文西光电有限公司 | A kind of dimming driving circuit |
| CN108432348A (en) * | 2015-12-31 | 2018-08-21 | 艾利迪公司 | Optoelectronic circuit including light emitting diode |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI477194B (en) * | 2013-05-29 | 2015-03-11 | Richtek Technology Corp | Light emitting diode drive device |
| WO2015190646A1 (en) * | 2014-06-09 | 2015-12-17 | 주식회사 르코어테크놀러지 | Led driving circuit |
| CN104822088B (en) * | 2015-04-16 | 2019-03-19 | 腾讯科技（北京）有限公司 | Video image zooming method and apparatus |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6989807B2 (en) | 2003-05-19 | 2006-01-24 | Add Microtech Corp. | LED driving device |
| US7081722B1 (en) | 2005-02-04 | 2006-07-25 | Kimlong Huynh | Light emitting diode multiphase driver circuit and method |
| KR100905844B1 (en) * | 2007-11-15 | 2009-07-02 | 삼성전기주식회사 | Apparatus for driving light emitting element |
| TWI418238B (en) | 2010-03-29 | 2013-12-01 | Integrated Crystal Technology Inc | Integrated circuit for driving high voltage led lamp |
| US8305005B2 (en) | 2010-09-08 | 2012-11-06 | Integrated Crystal Technology Inc. | Integrated circuit for driving high-voltage LED lamp |
| US8901849B2 (en) * | 2010-12-11 | 2014-12-02 | Jae Hong Jeong | Light emitting diode driver |
| US9144123B2 (en) * | 2010-12-11 | 2015-09-22 | Jae Hong Jeong | Light emitting diode driver having cascode structure |
-
2012
- 2012-06-01 TW TW101119651A patent/TW201352055A/en unknown
- 2012-07-20 CN CN2012203561146U patent/CN202799281U/en not_active Expired - Fee Related
- 2012-11-29 CN CN2012105008405A patent/CN103458562A/en active Pending
-
2013
- 2013-03-15 US US13/842,493 patent/US20140028206A1/en not_active Abandoned
- 2013-05-13 JP JP2013101347A patent/JP2013251537A/en active Pending
- 2013-05-28 KR KR1020130060340A patent/KR20130135757A/en not_active Application Discontinuation
- 2013-05-31 EP EP13002825.1A patent/EP2670217A1/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106664757A (en) * | 2014-06-30 | 2017-05-10 | 艾利迪公司 | Optoelectronic circuit having light-emitting diodes |
| CN108432348A (en) * | 2015-12-31 | 2018-08-21 | 艾利迪公司 | Optoelectronic circuit including light emitting diode |
| US10440788B2 (en) | 2015-12-31 | 2019-10-08 | Aledia | Optoelectronic circuit comprising light emitting diodes |
| CN108432348B (en) * | 2015-12-31 | 2019-12-31 | 艾利迪公司 | Optoelectronic circuit comprising a light-emitting diode |
| CN107959991A (en) * | 2017-10-23 | 2018-04-24 | 东莞达文西光电有限公司 | A kind of dimming driving circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2670217A1 (en) | 2013-12-04 |
| KR20130135757A (en) | 2013-12-11 |
| CN202799281U (en) | 2013-03-13 |
| US20140028206A1 (en) | 2014-01-30 |
| JP2013251537A (en) | 2013-12-12 |
| TW201352055A (en) | 2013-12-16 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131218 |